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Finding the Fourth Proportional to 28,471.78, 42,693.70 and 16,628.53

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Solution

The fourth proportional to 28,471.78, 42,693.70 and 16,628.53 is: 24,934.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,471.78 : 42,693.70 = 16,628.53 : x
  2. Step 2: Convert to fraction form
    28,471.78/42,693.70 = 16,628.53/x
  3. Step 3: Cross multiply
    28,471.78x = 42,693.70 × 16,628.53
  4. Step 4: Simplify right side
    28,471.78x = 709,933,303.99
  5. Step 5: Solve for x
    x = 709,933,303.99/28,471.78
  6. Step 6: Final answer
    x = 24,934.63

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.